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diff --git a/doc/environment_variables.md b/doc/environment_variables.md
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@@ -55,10 +55,12 @@ some configuration as environment variables that can be set.
- secure_endpoint - traces bytes flowing through encrypted channels
- transport_security - traces metadata about secure channel establishment
- tcp - traces bytes in and out of a channel
+
'all' can additionally be used to turn all traces on.
Individual traces can be disabled by prefixing them with '-'.
+
Example:
- export GRPC_TRACE=all,-pending_tags
+ export GRPC_TRACE=all,-pending_tags
* GRPC_VERBOSITY
Default gRPC logging verbosity - one of: